基于公路三维线形几何特性的行车安全分析

发布时间：2018-02-01 04:50

本文关键词： 道路工程行车安全三维线形曲率挠率突变几何连续性　出处：《中国公路学报》2015年09期 　论文类型：期刊论文

【摘要】：为了明确传统公路平、纵线形分离设计思想存在的不足及对行车安全的影响,从公路三维线形本质出发,采用空间曲率和挠率对现有线形几何特性进行描述,建立了基于二维设计要素的公路三维线形描述模型;利用SPSS分别建立了高速公路和双车道公路相邻路段平均曲率差、挠率差与事故率之间的关系模型。研究结果表明:公路线形设计时平纵线形的叠加并不能保证组合线形在三维空间中的连续性,当二维线形要素变化时,组合线形的连续性会存在不同程度衰减;空间曲率和挠率的突变量大小与行车安全强相关,其中曲率的连续对行车安全起主导作用,公路真三维线形设计应至少保证二阶几何连续。
[Abstract]:In order to make clear the shortcomings of the traditional design idea of highway plane and longitudinal line separation and its influence on the driving safety, the geometric characteristics of the existing alignment are described by space curvature and torsion from the highway three-dimensional alignment essence. The 3D linear description model of highway based on 2-D design elements is established. The difference of mean curvature of adjacent sections of expressway and two-lane highway is established by SPSS. The relationship between torsion difference and accident rate. The results show that the superposition of horizontal and longitudinal lines in highway alignment design can not guarantee the continuity of composite alignment in three-dimensional space, when the two-dimensional linear elements change. The continuity of the combination line will be attenuated to different degrees. The magnitude of abrupt change of space curvature and torsion is strongly related to driving safety, in which the continuous curvature plays a leading role in driving safety, and the highway true 3D alignment design should at least guarantee the second order geometric continuity.
【作者单位】：华南理工大学土木与交通学院;中南大学土木工程学院;
【基金】：国家自然科学基金项目(51278202,51408229)
【分类号】：U412.3
【正文快照】： 0引言中国道路交通事故发生率和死亡人数连续数年居世界前列。虽然造成交通事故的原因是多方面的,但公路线形作为整个工程的关键,其设计合理与否,直接影响到运行安全[1-2]。曲线段事故多发和大量的事故预测回归模型均表明线形几何要素对行车安全有重要影响[3]。现行公路线形均

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